If so, do those need to be handwritten?

Same for the RSVP. Should I handwrite my address in the to field or will labels work for that (the rsvp)
i asked a few months ago about labels and I got alot of people telling me they werent' acceptable so I kind of re worded my question to make sure everyone knows what im talking about
Our evelopes are red....i may have someone handwrite the TO address in silver pen.
the RSVP envelopes however will just be white.

labels are best, they are more professional and clean looking

I was going to handwrite everything on the envelope.

The person's address and my return address, is this ok?

If you go the label rout, look at using the clear address labels. They look better and you don't have to worry about the color not matching with your invites. Hand writting is more formal and traditional, but in these fast paced computer days, I say go with the labels. Who has time to sit down and hand address each one?

On the envelopes, you can have labels (preferably clear) that you can put your return address on.

Also, I'd place on the RSVP THEIR return address, that way if people don't put their return address, you still know who it came from (I had someone not put their return address OR their name on the RSVP card!).

Labels are perfect. The USPS does not have to worry about deciphering what you've placed on the envelopes.

You can use the clear labels and put your return address on the back of the envelope.